Neptune Insurance Holdings Inc. (NP) stock intrinsic value fair value estimate & owner earnings analysis

Neptune Insurance Holdings (NYSE: NP), through Neptune Flood of St. Petersburg, Florida, is a managing general agency that sells private flood insurance across the United States. It prices and underwrites each policy with its own automated system, sells through more than 23,000 independent agency relationships (about 97% of policies), and places the risk with a panel of reinsurers and insurance carriers, the largest of which accounted for 15.9% of premium at year-end 2025. Neptune collects commissions and fees on the premium it writes and does not pay claims, so a bad hurricane year hurts it indirectly, through its capacity providers' appetite and profit-sharing commissions, not through its balance sheet. At December 31, 2025 it had $370 million of annual premium in force (up 33.4%), 280,200 policies (up 26.8%), policy retention of 86.1% and premium retention of 96.3%. Revenue was $84.9M in 2023, $119.3M in 2024 and $159.6M in 2025, and $93.7M in the first half of 2026 (up 31%). Florida, Texas and Louisiana are 48.9% of policies. The founder and CEO controls about 82% of the vote through Class B shares. Earnings level. Owner earnings are cash from operations less working-capital swings, stock-based pay and the maintenance share of capitalised software. They were $15.6M (2023), $40.8M (2024) and $41.1M (2025), or about $0.12, $0.30 and $0.30 per as-converted share. Capital spending is tiny (about $4M a year of software). Stock-based pay jumped from $0.3M in 2024 to $11.4M in 2025 and $13.8M in the first half of 2026 after the October 2025 IPO; we treat it as a real, recurring cost, which is the main reason our figures sit well below the company's adjusted EBITDA. Because the business carries a $240M revolving loan, we value it before interest: adding back cash interest of about $17M gives business cash flow of about $58M in both 2024 and 2025. Only three years of audited history exist, so we anchor on the two years since the book reached scale (2024 to 2025), about $58M, and flag that this is a short record. Growth path. Business cash flow grew under 1% in 2025 because the new stock pay offset 34% revenue growth. We start 2026 at $64M rather than at that trailing rate for a dated, filed reason: premium in force was already 33% higher at the end of 2025, those policies renew at 96% premium retention, and first-half 2026 revenue confirmed it (up 31%) even after higher stock pay. Beyond business already on the books we credit only modest growth (6% in 2027, then about 2 to 3%), because each year the book loses roughly 14% of policies and must replace them with new sales; Neptune has done this every year, but only since 2016 and never through a period when capacity providers withdrew, so faster growth from share gains against the NFIP, new products such as excess, commercial and earthquake cover, or margin expansion is left out. Base case: business cash flow of $64M in 2026, rising to about $80M by 2035, held flat for ten years on the strength of the agency network, retention record and pricing system, then fading 5% a year as competition and regulation erode it. The business is worth about $1.07 billion; less net debt of $222M ($240M revolver less $17.6M cash at June 30, 2026) leaves about $849M, or $5.80 per diluted share (146.2M shares). Bear case: one severe hurricane and flood year of the 2005 (Katrina, Rita, Wilma) or 2017 (Harvey, Irma, Maria) kind hits the Gulf states where half the book sits. Capacity providers lose money, cut appetite and raise their price, profit-sharing commissions vanish, and Neptune must re-price or shed business, so business cash flow drops about 30% in 2027 and another 10% in 2028, recovers only partly to about $46M, and then fades 7% a year after 2035 as private-flood margins normalise or federal NFIP reform narrows the price gap. The business is worth about $522M; less $222M of debt leaves about $300M, or $2.05 per share. Interest of roughly $15M is covered about three times even at the trough, so the revolver (due November 2030, net leverage covenant 4.0x) is carried in this case. Bull case: the company's own levers keep working, with policy growth and renewal premium carrying business cash flow from $66M to about $114M by 2035 (growth tapering from 15% to 3%), held there fifteen years then fading 4% a year. The business is worth about $1.54 billion; less $222M of debt leaves about $1.32 billion, or $9.02 per share. Margin-of-safety price. We are moderately sure of the earnings level: the cash conversion is clean and the book of renewals is visible, but there are only three audited years, stock pay has just reset higher, and the whole record sits inside a benign period for capacity. The worst plausible outcome is not a claims loss on Neptune's own books but its reinsurers and carriers walking away after a catastrophe, or Congress reshaping the NFIP so that the private-flood price advantage shrinks; with the largest provider at 15.9% the panel is diversified, the debt is modest relative to cash flow, and the business would survive, but it would be worth far less. If we are wrong about capacity staying available and about stock pay staying near $25M a year, the shares are worth close to the bear case, around $2. The company pays no dividend and is spending cash on buybacks ($31.9M in the first half of 2026) and debt service, so the return in the meantime comes mainly through cash flow of roughly $0.40 to $0.45 per share a year, about 12% of a $3.50 price. From $3.50 the base case implies 20% a year over about four years, and the bear case implies roughly breaking even after several years of retained cash. The margin-of-safety price is $3.50. This is a first analysis on the full filed record; the previous estimate relied on management's adjusted EBITDA guidance and is not comparable.